[es6] implement destructuring assignment

src/full-codegen/full-codegen.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/full-codegen/full-codegen.h"
 
 #include "src/ast/ast.h"
 #include "src/ast/ast-numbering.h"
 #include "src/ast/prettyprinter.h"
 #include "src/ast/scopeinfo.h"
@@ skipping 1481 matching lines @@
 
 
 void FullCodeGenerator::VisitSpread(Spread* expr) { UNREACHABLE(); }
 
 
 void FullCodeGenerator::VisitEmptyParentheses(EmptyParentheses* expr) {
   UNREACHABLE();
 }
 
 
+void FullCodeGenerator::VisitRewritableExpression(RewritableExpression* expr) {
+  Visit(expr->expression());
+}
+
+
 FullCodeGenerator::NestedStatement* FullCodeGenerator::TryFinally::Exit(
     int* stack_depth, int* context_length) {
   // The macros used here must preserve the result register.
 
   // Because the handler block contains the context of the finally
   // code, we can restore it directly from there for the finally code
   // rather than iteratively unwinding contexts via their previous
   // links.
   if (*context_length > 0) {
     __ Drop(*stack_depth);  // Down to the handler block.
@@ skipping 230 matching lines @@
   return var->mode() == CONST_LEGACY || var->scope()->is_nonlinear() ||
          var->initializer_position() >= proxy->position();
 }
 
 
 #undef __
 
 
 }  // namespace internal
 }  // namespace v8